Adding modding folder with a hacked build.

modding/hacked/ss1/edit/undoable/Command.go

@@ -0,0 +1,25 @@
+package undoable
+
+import (
+	"github.com/inkyblackness/hacked/ss1/world"
+)
+
+type command struct {
+	forward func(world.Modder)
+	reverse func(world.Modder)
+	restore func()
+}
+
+func (c command) Do(modder world.Modder) error {
+	return c.perform(modder, c.forward)
+}
+
+func (c command) Undo(modder world.Modder) error {
+	return c.perform(modder, c.reverse)
+}
+
+func (c command) perform(modder world.Modder, callback func(setter world.Modder)) error {
+	callback(modder)
+	c.restore()
+	return nil
+}